WhitakerAudio JC Whitaker 20 W Stereo Integrated Audio Amplifier, Manual

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20 W Stereo Integrated Audio Amplifier
Addendum
The 20 W Stereo Integrated Hybrid Amplifier User and Assembly Manual is written with the
assumption that the user has purchased the product from WhitakerAudio as a ready-to-assemble
package. For builders that have acquired the components on their own and are using the manual as
an assembly guide, it is recommended that the parts be divided into the packaging referred to in
the manual.
In the process of acquiring parts for this amplifier, a number of vendors will be used. As such,
parts will arrive lumped together and will also arrive at various points in time. The process used
by WhitakerAudio involves organizing the components into four major groups:
• 20 W Stereo Amplifier PWB #1 (Right Channel) components
• 20 W Stereo Amplifier PWB #2 (Left Channel) components
• Transistorized Preamplifier Module components
• Power Management Module components
• Chassis components
Parts are organized by component number and device type. For example, all 1 k
Ω
1/2-watt
resistors for the transistorized preamplifier PWB are packaged together. Each group of parts is
placed in a resealable (clasp-type) envelope with a self-adhesive label applied. Labels such as
Avery #5260 are useful for this purpose. Recommended envelopes include the following:
• 2.25-inch by 3.5-inch envelope (Staples no. 1 coin envelope)
• 3-3/8-inch by 6-inch envelope (Staples no. 6 coin envelope)
• 6-inch by 9-inch clasp envelope (Staples)
While this sorting requires some up-front organizational time, it serves as a check that all parts
are accounted for and speeds assembly of the PWBs and chassis components.
The following tables list the labels used for the five component groups.
Table 1 The 20 W Stereo Amplifier PWB #1(Right Channel)) Component
Package Labels
C1
47 μF, 450 V electrolytic,
Amplifier PWB #1 (right)
R1
1 mΩ, 0.5 W,
Amplifier PWB #1 (right)
V1
6U8A tube,
Amplifier PWB #1 (right)
C2, C4, C5
0.22 μF, 400 V, 5%
Amplifier PWB #1 (right)
R2
10 kΩ, 0.5 W,
Amplifier PWB #1 (right)
V2, V3
6973 tube,
Amplifier PWB #1 (right)